I'd add spark plug tubes and o-rings to the list if they haven't already been done. Especially if that small amount of leaking is from the area of the heads.
Change Spark Plugs and Tubes Boxster DIY
Mine came out just like in post #7 of this thread, only difference was I had a section of old heater hose cut to fit the mid-section of the 'extraction tool':
http://986forum.com/forums/diy-project-guides/52150-spark-plug-tubes.html
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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